# year = int(input("请输入一个年份："))
#
# if (year % 4 == 0 and year % 100 != 0) or year % 400 == 0:
#     print(year, "是闰年")
# else:
#     print(year, "不是闰年")

import sys
a = map(int,input())
if a:
    print('Hello World!')
else:
    print('Erros!')

import os